练习3-28

原文

Exercise 3.28. Define an or-gate as a primitive function box. Your or-gate constructor should be similar to and-gate.

代码

(define (or-gate input-1 input-2 output)    (define (or-action-procedure)        (let ((new-value (logical-or (get-signal input-1) (get-signal input-2))))            (after-delay or-gate-delay                         (lambda () (set-signal! output new-value)))))    (add-action! input-1 or-action-procedure)    (add-action! input-2 or-action-procedure)    'ok)(define (logical-or x y)    (if (or (= x 1) (= y 1))        1        0))

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